알칼리 용융 및 수 침출을 이용한 탄화텅스텐으로부터 텅스텐 회수
Tungsten Recovery from Tungsten Carbide by Alkali Melt followed by Water Leaching
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초록
알칼리 용융법과 수 침출을 이용하여 탄화텅스텐(WC)으로부터 텅스텐(W) 회수에 관한 연구를 실시하였다. 알칼리 용융 처리는알칼리염의 종류, 용융온도 및 용융시간을 변화시키면서 실시하였으며, 수 침출은 25oC, 2시간 및 슬러리 농도 10 g/L로 고정하여실시하였다. 알칼리염으로 질산나트륨(NaNO3)만 단독으로 사용한 경우, W의 수 침출율은 63.3%이었지만, 용융 첨가제인 수산화나트륨(NaOH) 혼합량이 증가할수록 침출율은 증가하였으며, 몰비 WC:NaNO3:NaOH=1:2:2로 혼합한 용융물에서는 97.8%까지 증가하였다. NaOH는 용융 반응의 반응열 증가로 인한 반응 촉진제 역할을 한 것으로 판단된다.
Abstract
Tungsten (W) recovery from tungsten carbide (WC) was researched by alkali melt followed by water leaching. The experiments of alkali melt were carried out with the change of the sort of alkali material, heating temperature, and the heating duration. Water leaching of W was performed in the fixed conditions (25oC, 2 hr., slurry density: 10 g/L). From the mixture of WC and sodium nitrate (NaNO3) in the molar ratio of 1:2, treated at 400oC for 6 hours, only 63.3% of W might be leached by water leaching. With the increase of sodium hydroxide (NaOH) as a melting additive, the leachability increased. Finally it reached to 97.8 % with the melted mixture of (WC:NaNO3:NaOH) in the ratio of (1:2:2). This imply that NaOH may play a role as a reaction catalyst by lowering Gibb’s free energy for alkali melt reaction for WC.
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